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SECURENET(5) File Formats Manual SECURENET(5)

securenet
ypserv(8) configuration file for secure networks

The securenet file controls which hosts can connect to the YP server.
The format is rather simple. Each row consists of two items. The first item is the network mask. The second item is the network.

/var/yp/securenet
a ypserv(8) configuration file

A configuration file might look like the following:
# 
# Only my local net is secure. 
# 
255.255.255.0 139.58.253.0

ypserv.acl(5), yp(8), ypserv(8)

The securenet file was added to NIS by Sun Microsystems, Inc. as a bugfix for weak security.
September 10, 2015 OpenBSD-current